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Does anyone know how a Liang D5 pump works?

post #1 of 5
Thread Starter 
Hey guys, I'm really curious on how a Liang D5 pump works. I just got one today for my WC loop and I was amazed/curious on how its magnetized. Google doesnt have any information as far as I can find. Any help ? Thanks! smile.gif
post #2 of 5
http://documentlibrary.xylemappliedwater.com/files/documents/2011/04/LTSS-27.pdf

The Ecocirc electrically commuted spherical motor design offers many benefits over other pump styles. The Laing design operates on extremely low power input at a specified nominal voltage from 8 to 24 volts; the spherical permanent magnet eliminates impeller slippage which makes the Laing pump up to 40% more efficient than a standard induction motor. The motor has no shaft and therefore no shaft seal that is a wear point and potential leak path. Pump operation is virtually silent, with a low 35 db noise level. The brushless motor has a lifetime in excess of 50,000 hours when operated at nominal voltage and can be powered directly by solar panels, battery or other DC power sources. The unique screw ring design for this series of pumps allows for changing motors without disturbing the pump housing piping. The vario also features a potentiometer which allows the user to dial in the speed they need for the application.

The Principle of the Spherical Motor
Invented by Laing, it is fundamentally different from conventional canned motor pumps. The only moving part in a spherical motor is a hemispherical rotor/impeller unit which sits on an ultra-hard, wear-resistant ceramic ball. There are no conventional shaft bearings or seals. This eliminates bearing noise and seal leaks. This pump is robust and has an estimated service life in excess of 50,000 hours. The D5 Solar can be easily and safely installed by following detailed instructions from a Laing Installation Guide.


(you have to love google! smile.gif )
post #3 of 5
My understanding of the how the impeller spins was similar to how mag-lev works.

Mag-lev is a type of train rail system. It works on the basic principle that two magnetic poles repel each other. By placing a magnet underneath the train and running it on top of another magnet, the train is repulsed from the track and pushed forward.

The same principle is applied to the impeller I believe. Instead of any mechanical componentry spinning the impeller itself, it's suspended in fluid and powered by an electromagnet.

Less moving parts equals less wearing down of parts, and less noise.

Theoretically you could also get incredibly high RPM on the impeller due to the fact it's suspended in a fluid.

That's only a guess though. I have absolutely no idea how the pump works other than it sucks water in one hole and blows it out the other.
post #4 of 5
The Lainge D5 and DDC pumps 'work' much like any other electric motor.

The rotor , in this case the impeller with strong permanent magnets mounted inside it, is spun by and inside of the stator, which is the metal cup that the impeller sits in and is surrounded by copper windings. Current in the windings generates the force that spins the rotor/impeller.

They are a rather clever design that uses the magnetic attraction of the rotors magnets to keep the rotor mounted on its single mounting and bearing point. The ceramic and carbon bearing points of the 'shaft' and the impeller are lubricated, and the pump itself is cooled by the water that flows through them.
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post #5 of 5
The D5 is a good pump. The impeller being the only movable part. thumb.gif

The mag-lev pumps offer quiet operation and the best power to performance ratio for the energy applied to them.

The only downside with the Laing pumps is the cap on the impeller veins. If there is a flow restriction on the inlet side of the pump, cavitation will occur. The strange phenomenon will tear apart the impeller internally on the veins. Just make sure the flow going into the pump is amply supplied well.
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